Overview
IEC TR 63362-1:2022 - Application of fixed capacitors in electronic equipment - Part 1: Aluminium electrolytic capacitors - is a Technical Report by the IEC that provides practical guidelines for the correct application, handling and selection of aluminium electrolytic capacitors. It focuses primarily on capacitors with non‑solid electrolyte, while several clauses are also applicable to solid electrolyte types. This first edition replaces CLC/TR 50454 (2008) and includes a complete technical revision, added guidance on cleaning processes and failure modes, and incorporation of parts of JEITA RCR 2367D.
Key topics and technical requirements
The report addresses the specific electro‑chemical behavior of aluminium electrolytic capacitors and gives guidance to reduce misapplication risks and safety hazards. Major technical topics include:
- Polarity and reverse voltage considerations to avoid catastrophic failure.
- Voltage ratings: rated, surge and transient voltages and their application limits.
- Temperature range and environmental limits for reliable operation.
- Ripple current handling and impact on lifetime and heating.
- Charge/discharge procedures and precautions.
- Storage, transportation and operation best practices.
- External pressure effects (relevant to non‑solid electrolyte parts) including low/high air pressure.
- Dielectric absorption (self‑recharge) phenomenon and implications for circuits.
- Flammability: passive vs active flammability behavior and risk mitigation.
- Internal pressure and pressure relief devices design/placement and safety.
- Electrolyte handling: contact, leakage and contamination risks.
- Parallel/series connections and voltage sharing, including balancing resistor methods and analysis.
- Clearance and creepage distances internally and on PCBs.
- Mounting and soldering: positioning, torque, lead stress, preheat/soldering parameters and post‑solder care.
- Cleaning solvents and processes: selection, process control and precautions to avoid damage.
- Potting and gluing materials and curing impacts.
- Selection and failure mechanisms under overload, plus disposal guidance.
Figures and tables (e.g., balancing resistor examples, degradation mechanisms) support the guidance.
Practical applications
This Technical Report is intended for professionals who design, manufacture, test or maintain electronic equipment that uses aluminium electrolytic capacitors. Typical applications and use cases:
- Power supplies, converters and motor drives where high capacitance and ripple handling are required.
- PCB layout and assembly processes that must respect clearance, mounting and soldering rules.
- Reliability engineering and failure analysis - understanding degradation and overload mechanisms.
- Manufacturing process engineers - selecting appropriate cleaning, potting and handling procedures.
- Compliance officers and procurement teams assessing component suitability and safety.
Who should use this standard
- Electronic design engineers
- PCB/layout engineers
- Reliability and test engineers
- Manufacturing/process engineers
- Quality, safety and compliance personnel
- Component suppliers and OEMs
Related standards
IEC TR 63362-1:2022 references and builds on existing capacitor standards and relevant industry documents (including parts of JEITA RCR 2367D). Users should consult normative references cited in the report for complete technical application and compliance.